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Stabilization of perovskite phase and dielectric properties of Pb(Zn, Mg)1/3Nb2/3O3-PbTiO3 ceramics prepared by excess constituent oxides

Published online by Cambridge University Press:  03 March 2011

Hyun M. Jang ,
Kyu-Mann Lee  and
Moon-Ho Lee
Hyun M. Jang*
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang University of Science and Technology (POSTECH), Pohang 790-600, Republic of Korea
Kyu-Mann Lee
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang University of Science and Technology (POSTECH), Pohang 790-600, Republic of Korea
Moon-Ho Lee
Affiliation:
Department of Metallurgy, College of Engineering, Yeungnam University, Kyungsan 713-800, Republic of Korea
*
a)Author to whom correspondence should be addressed.
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Abstract

The perovskite phase in PZN-PMN-PT (PbZn1/3Nb2/3O3-PbMg1/3Nb2/3O3-PbTiO3) pseudoternary ceramics was stabilized by the addition of excess constituent divalent oxides (PbO, MgO, and ZnO). 5 mol% excess MgO or 7.5 mol% excess PbO was sufficient to eliminate the remnant cubic pyrochlore phase after sintering at 1100 °C for 1 h. The enhanced diffuse phase transition (DPT) and the decrease in the electrical resistivity were observed in the presence of excess ZnO or MgO. These were interpreted in terms of the additional formation of negatively charged, short-range ordered 1: 1 domains with a concomitant generation of charge carriers (holes). The behavior of excess MgO or ZnO at concentrations above 5 mol% was studied by examining complex impedance patterns.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 10 , October 1994 , pp. 2634 - 2644
Copyright
Copyright © Materials Research Society 1994

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